Hi all! My name is JJ, and I'm new to the forum. I have a 2000 Mazda B2500. The truck runs cool. Temp guage will slowly make its way up to operating temperature, but if I drive on the highway the increased airflow will cool it back down and the gauge goes back down to "C". I noticed that the coolant fan runs regardless of how cold the engine is. As soon as I start the truck in 30 degree weather, the fan runs. If the engine is on, fan is on. I took the fan off and it did not appear to have a temperature sensor, so I think this is one of those fans that runs at all times and just constantly cools the engine. Does that sound right? It also spins nicely and does not appear that any internal clutch--if any--has seized up. My question is: what type of fan came on this truck? Should I try a fan that has a temperature sensor/clutch so that it only runs when the engine gets hot?